Australian netball coach Norma Plummer says complacency is one of her team's biggest threats heading into next month's world championship.

Many consider the world titles in Singapore a two-horse race between defending champions Australia and world No.1-ranked side and Commonwealth Games champions New Zealand.

Ahead of the team flying out for a four-day training camp in Hong Kong, Plummer cautioned about the athletic Jamaican side.

She also warned England could pose a threat.

"Top four, on any given day it could be anyone's game," Plummer said.

"That's what you have to be very mindful of, if you get complacent, not good."

The Australians open the titles against Samoa on July 4, followed by pool matches against Northern Ireland and Sri Lanka.

They are then likely to face Jamaica in the semi-finals.

Plummer said she would run all of her players during the pool games while working on her combinations but the Sunshine Girls were a far tougher prospect.

"I'm very worried about Jamaica," Plummer said.

"Romelda Aitken has blossomed in the ANZ Championships and then you've got young (Jhaniele) Fowler, the same height and I think even a better athlete.

"They're always an unknown quantity ... if I underestimate them we could get burnt.

"We're going to be working overtime to get them."

Plummer said confidence was high amongst the Diamonds after they split the results of a two-match series against New Zealand.

"I was absolutely rapt because New Zealand had to throw everything at us," she said.

"We took New Zealand's number one side that they had in the grand final of the Commonwealth Games right up to the line.

"This team is a winning side."

Captain in spirit

The Diamonds line-up is missing regular skipper Sharelle McMahon, who ruptured her Achilles tendon ruling her out of the championship.

While McMahon has not officially confirmed her retirement, she acknowledged her international career was likely over when she made a presentation of the Diamonds' captain's necklace to new skipper Natalie von Bertouch.

It was previously worn by Liz Ellis before McMahon.

"It's no secret that I would like to be hanging on to this for a little bit longer," McMahon said.

"As soon as I realised that wasn't going to happen I turned myself to a new goal and that was to be the best supporter that you guys will have."

Von Bertouch said she spoke to McMahon frequently and planned to call on her experience during the championship.

"Sharelle's done a fantastic role as captain," she said.

"We have a fantastic, open relationship and I will be using that, particularly in the first stages of my captaincy as I learn the ropes a bit more."

Melbourne Vixens' Madison Browne, who was travelling with the team as a training partner, was forced to withdraw due to her wisdom teeth requiring surgery, with NSW Swifts midcourter Vanessa Ware rushed into the squad.